Calculate the iodine Number.
0.115g of an unknown lipid
10.0mL of Hanus iodine solution
0.09787M Sodium Thiosulfate (Na2S2O3)
Volume of Sodium Thiosulfate required to neutralize in Blank: 21.42mL
0.115g of the lipid consumed 8.84mL of Sodium Thiosulfate.
Calculate the iodine Number. 0.115g of an unknown lipid 10.0mL of Hanus iodine solution 0.09787M Sodium...
4. a) A solution of potassium hypochlorite (KOCI) is prepared by dissolving 0.61 g of potassium hypochlorite in water in a 250 cmº volumetric flask and making up to the mark. What is the molarity of the solution? b) A 10 cm3 aliquot of the potassium hypochlorite solution is added to a conical flask containing an excess of potassium iodide thus generating molecular iodine (12) according to the following reaction: KOCI + 2HCl + 2K1 + 3KCl + H2O +...
A chemist must prepare 700.mL of 2.00M aqueous sodium thiosulfate Na2S2O3 working solution. He'll do this by pouring out some 3.15mol/L aqueous sodium thiosulfate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the sodium thiosulfate stock solution that the chemist should pour out. Round your answer to 3 significant digits.
If you have 275 mg of sodium thiosulfate in 20 mL of water, and 14.8 mL of this solution was required to titrate 104 mg of iodine in 20 mL of solution, what is the amount in mg of Na2S2O3 that is required to completely reduce the 104 mg of I2?
A 10.00 ml sample of .0.0100 M KIO3 was titrated against a solution of sodium thiosulfate to standardize it. The initial buret volume reading was 0.07 ml. The final buret reading was 6.54 ml. Calculate the [Na2S2O3].
A chemist must dilute 31.8mL of 4.67M aqueous sodium thiosulfate Na2S2O3 solution until the concentration falls to 3.00M . He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in milliliters. Round your answer to 3 significant digits.
A sample of sodium percarbonate (Na2CO3*nH2O2) weighing 0.024g is diluted using a 0.10 M solution of sodium thiosulfate (Na2S2O3). The volume of sodium thiosulfate used is 4.25mL. There are 3 questions: 1. What is the amount of hydrogen peroxide in the sample in moles? 2. What is the amount of sodium carbonate in the sample in moles? 3. What is the molar ratio of H2O2:Na2CO3? So far, I've found that there are 0.000425 mol Na2S2O3 ; however, I'm unsure how...
In one trial of the standardization of a Na2S2O3 solution, a 10.00 mL volume of 5.00×10-3 M KIO3 is pipetted into a 250 mL Erlenmeyer flask. The solution is titratedto the endpoint with 15.23 mL of the Na2S2O3 solution. What is the molar concentration of this sodium thiosulfate solution?
4. a) A solution of potassium hypochlorite (KOCI) is prepared by dissolving 0.61 g of potassium hypochlorite in water in a 250 cm3 volumetric flask and making up to the mark What is the molarity of the solution? b) A 10 cm aliquot of the potassium hypochlorite solution is added to a conical flask containing an excess of potassium iodide thus generating molecular iodine (l2) according to the following reaction: KOCI2HCI2KI 3KCI HO l2 The iodine is then titrated against...
In the Iodination of Salicylamide, active iodine was created by the action of sodium hypochlorite on sodium iodide. When the reaction was complete, 10% sodium thiosulfate solution was added to the reaction mixture before acidification. What is the role of sodium thiosulfate in this procedure? A. It tests the pH of the mixture. B. It destroys excess sodium hypochlorite. C. It removes water from the organic layer. D. It protects salicylamide from the harsh acid. I have seen that the...
Titration of the I2 produced from .1045g of primary standard KIO3 required 30.72ml of sodium thiosulfate Calculate the concentration of the Na2S2O3